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# Bottled water study

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4.44) A four year study of bottled water brands conducted by the natural resources defense council found that 25% of bottled water is just tap water packaged in a bottle. Consider a sample of five bottled water brands and let x equal the number of these brands that use tap water.
a. explain why x is a binomial random variable
b. give the probability distribution for x as a formula
c. find p(x=2)
d. find p(x <&= 1)

4.54) Suppose you are a purchasing officer for a large company. Ypu have purchased 5 million electrical switches, and your supplier has guaranteed that the shipment will contain no more than .1% defectives. to check the shipment you randomly sample 500 switches, test them and find that four are defective. Based on this evidence, do you think the supplier has complied with the guarantee. Explain.

https://brainmass.com/statistics/hypothesis-testing/bottled-water-study-529398

#### Solution Preview

Hi there,

Thanks for letting me work on your post. Here is my explanation:

4.44) a) since for the water package, it is either tap water packaged or not tap water packaged. Further, each sample ...

#### Solution Summary

A bottled water study for a random variable are examined.

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## Yeast and Sugar Study

I have just finished doing a science project with my son (8th grade). We tested the best conditions for growing yeast. We used four empty water bottles-one with only yeast and warm water, one with yeast and 1/2 teaspoon sugar and warm water, one with yeast and 1 tablespoon sugar and warm water, and the last bottle was only yeast with no water or sugar as our control. Immediately after adding the ingredients we put balloons over the top of the water bottles and watched them grow (or not). We measured the height of the balloons. We wrote down the results and made nice graphs to go with our data. The sugar really reacted with the yeast.

The last part of our project is to write a small paper (a few paragraphs) that would include the following:

Tell exactly what you did, how you did it, and what you discovered. Be sure to write about your plan and your experiment. Be sure to also include some of the background information you learned.

I do not know much about science and I have no idea what we really discovered. I also do not know what our plan or experiment even was.

Thanks

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